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Roberto Ierusalimschy wrote:
> > But de Morganising makes bor use four calls to band (three via bnot), so
> > to avoid that I kept bor primitive.
> You forgot the other "bunny" (whatever that means ;-):
> >    not A = -A - 1     (Paul Hsieh wrote that)
> So, you have
> function bor (a,b) return -band(-a-1, -b-1)-1 end

One problem though:  -A := not(A)+1  is for 2-complement.
Floating point numbers (normally) do not use 2-complement

Ciao, ET.